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LOAN SERVICING - Sensitivity of Fair Value to Changes in key Assumptions (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Mortgage Servicing Rights [Member]    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Weighted average life (months) 75 months 82 months 6 days
Constant prepayment rate (annualized) 11.20% 10.10%
Discount rate 9.70% 9.70%
Sensitivity analysis of fair value, change in interest rates, plus .25% $ 3 $ 3
Sensitivity analysis of fair value, change in interest rates, plus .50% 5 5
Sensitivity analysis of fair value, change in interest rates, minus .25% (3) (3)
Sensitivity analysis of fair value, change in interest rates, minus .50% $ (5) $ (6)
SBA-Guaranteed Loan Servicing [Member]    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Weighted average life (months) 44 months 6 days 52 months 6 days
Constant prepayment rate (annualized) 15.90% 12.50%
Discount rate 17.90% 19.40%
Effect on fair value due to 10% adverse change of consistent repayment rate $ 0 $ 0
Effect on fair value due to 20% adverse change of consistent repayment rate 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in prepayment speed 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in prepayment speed 0 0
Effect on fair value due to 10% adverse change of discount rate 0 0
Effect on fair value due to 20% adverse change of discount rate 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in discount rate 0 0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in discount rate $ 0 $ 0